The Collaborative International Dictionary of English v.0.48:

Euxanthin \Eux*an"thin\, n. [Gr. e'y^ well + ? yellow.] (Chem.)
   A yellow pigment imported from India and China. It has a
   strong odor, and is said to be obtained from the urine of
   herbivorous animals when fed on the mango. It consists if a
   magnesium salt of euxanthic acid. Called also puri,
   purree, and Indian yellow.
   [1913 Webster]